cmd/compile: calls can clobber g on s390x
Because a call may ultimately invoke runtime.setg, we have to assume
that g may be clobbered by any call. All of the other architectures
that use a g register already do this, but it was missing from the
s390x caller save clobber set.
Change-Id: Ia931638d42c44979839f20d71097acf31475f423
Reviewed-on: https://go-review.googlesource.com/92835
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
diff --git a/src/cmd/compile/internal/ssa/gen/S390XOps.go b/src/cmd/compile/internal/ssa/gen/S390XOps.go
index ab781ce..ec4c9b2a 100644
--- a/src/cmd/compile/internal/ssa/gen/S390XOps.go
+++ b/src/cmd/compile/internal/ssa/gen/S390XOps.go
@@ -124,7 +124,7 @@
ptrspsb = ptrsp | sb
fp = buildReg("F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15")
- callerSave = gp | fp
+ callerSave = gp | fp | buildReg("g") // runtime.setg (and anything calling it) may clobber g
)
// Common slices of register masks
var (
diff --git a/src/cmd/compile/internal/ssa/opGen.go b/src/cmd/compile/internal/ssa/opGen.go
index 0beabb0..7569545 100644
--- a/src/cmd/compile/internal/ssa/opGen.go
+++ b/src/cmd/compile/internal/ssa/opGen.go
@@ -21883,7 +21883,7 @@
call: true,
symEffect: SymNone,
reg: regInfo{
- clobbers: 4294923263, // R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 R12 R14 F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15
+ clobbers: 4294931455, // R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 R12 g R14 F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15
},
},
{
@@ -21897,7 +21897,7 @@
{1, 4096}, // R12
{0, 54270}, // R1 R2 R3 R4 R5 R6 R7 R8 R9 R12 R14 SP
},
- clobbers: 4294923263, // R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 R12 R14 F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15
+ clobbers: 4294931455, // R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 R12 g R14 F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15
},
},
{
@@ -21910,7 +21910,7 @@
inputs: []inputInfo{
{0, 21502}, // R1 R2 R3 R4 R5 R6 R7 R8 R9 R12 R14
},
- clobbers: 4294923263, // R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 R12 R14 F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15
+ clobbers: 4294931455, // R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 R12 g R14 F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15
},
},
{
